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Proceedings Paper

Improving detection and discrimination of buried metallic objects in magnetic geologic settings by modeling the background soil response
Author(s): Leonard R. Pasion; Stephen D. Billings; Douglas W. Oldenburg
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Paper Abstract

Magnetic soils are a major source of false positives when searching for unexploded ordnance with electromagnetic induction sensors. In adverse areas up to 30% of identified electromagnetic induction anomalies have been attributed to geology. In the presence of magnetic soil, sensor movement and surface topography can cause anomalies in the data that have similar size and shape to those from compact metallic targets. In areas where the background geological response is small relative to the response of metallic targets, electromagnetic induction data can be inverted for the dipole polarization tensor. However, spatially correlated noise from the presence of a geologic background greatly reduces the accuracy of dipole polarization estimates. In this presentation we examine the effects of sensor movement on the measured EM response of a magnetic background signal. We demonstrate how sensor position and orientation information can be used to model the background soil response and improve estimates of a target's dipole polarization tensor.

Paper Details

Date Published: 29 April 2008
PDF: 12 pages
Proc. SPIE 6953, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XIII, 695310 (29 April 2008); doi: 10.1117/12.779903
Show Author Affiliations
Leonard R. Pasion, Univ. of British Columbia (Canada)
Sky Research, Inc. (Canada)
Stephen D. Billings, Sky Research, Inc. (Canada)
Douglas W. Oldenburg, Univ. of British Columbia (Canada)

Published in SPIE Proceedings Vol. 6953:
Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XIII
Russell S. Harmon; John H. Holloway Jr.; J. Thomas Broach, Editor(s)

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